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Thanks all. :-D
Hogan - He did travel with them for a while, so he would know about the helmets of holding.
Joff - Which information? About Ygraasnoj?
Well, they didn't realize Jason was a cultist until #47, then it just became a rescue, the distinction between sacrifice & handing over would have been unimportant.
When Nikki mentioned sacrifice in #48 Jason said it was a handing over not a sacrifice, which I thought foreshadowed the concept of giving over a living woman as clarified here.